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Star quality: police look on in New York

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It takes place every year but No Trousers Day still manages to surprise more than a few commuters. The event, which was first staged as a joke in New York City in 2002, saw train users in 60 countries taking off their slacks to give onlookers a giggle. In London, the Tube was flooded with half-naked passengers. Here are some of the best pictures from around the world.